Dynamical properties of wall-confined colloids

We report on a Stokesian Dynamics simulation study of monolayers of spheric al colloidal particles diffusing in the midplane between two parallel walls . The method accounts for many-body hydrodynamic interactions (HI) between particles and particles and walls. Two cases are studied: hard spheres betw een neutral walls and charged particles interacting by a Yukawa-type potent ial. Various properties are calculated: mean-squared displacement, self-dif fusion coefficient, von Hove functions and hydrodynamic functions. The impo rtance of HT is assessed by treating particle-particle and particle-wall HI separately. Striking features are discussed like the hydrodynamic enhancem ent of self-diffusion for strongly charged particles and the unbounded incr ease of the hydrodynamic function at small wave numbers.